import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

//编写代码, 基于 Callable 实现 1+2+3+...+100
public class Homework {
    public static void main(String[] args) throws InterruptedException, ExecutionException {
        Callable<Integer> callable = new Callable<Integer>() {
            @Override
            public Integer call() throws Exception {
                int sum1 = 0;
                for (int i = 1; i <1001 ; i++) {
                    sum1+=i;
                }
                return sum1;
            }
        };
        FutureTask<Integer> futureTask = new FutureTask<>(callable);
        Thread t = new Thread(futureTask);
        t.start();
        t.join();
        System.out.println("sum = "+futureTask.get());
    }
}
